Debt Payoff Calculator

The two proven strategies are the Debt Avalanche — paying the highest-interest debt first to minimize total interest paid — and the Debt Snowball — paying the smallest balance first for psychological momentum. Research by financial economists and the CFPB shows the Avalanche saves the most money, but the Snowball leads to better follow-through for many borrowers. Adding any extra monthly payment dramatically accelerates payoff regardless of strategy.

We apply the standard amortization formula month by month. Each month, interest is calculated on the remaining balance using your APR ÷ 12. Your payment is applied first to cover that interest charge, and the remaining amount reduces your principal. We count how many months it takes for the balance to reach zero — that is your payoff date. This is the same method used by all major banks and the Federal Reserve for consumer debt calculations.

According to Federal Reserve data (Q1 2025), the average credit card APR in the United States is approximately 21–22%. Personal loans average around 12%. As a rule of thumb:

• Below 10%: Healthy rate — manageable and low-priority vs. investing.
• 10%–20%: Elevated — should be a clear financial priority, especially above 15%.
• Above 20%: High-risk zone — you are likely losing ground faster than you realize.

With high interest rates, most of your minimum payment goes toward the interest charge, leaving very little to reduce the actual principal. For example, on a $5,000 balance at 20% APR, the monthly interest alone is ~$83. A minimum payment of $100 only reduces your principal by $17. Extra payments go 100% toward principal and eliminate future interest on that portion — making even small extra amounts disproportionately powerful.

A widely accepted personal finance rule: if your debt interest rate is higher than your expected investment return (the S&P 500 has averaged ~7–10% annually over the long term), pay off the debt first. High-interest credit card debt at 20%+ should almost always be eliminated before investing, because guaranteed 20% savings beats uncertain 7-10% gains. For lower-rate debt like a mortgage at 6-7%, investing alongside debt repayment can be a sound strategy.

Our calculator provides a real-time health rating for each debt based on your interest rate and payment:

• 🔴 Debt Trap: Your payment doesn't even cover the monthly interest. Your debt is growing every month.
• 🔴 Danger Zone: APR above 20%. These high rates make it nearly impossible to make progress without extra payments.
• 🟡 Caution: APR 10-20%. Manageable, but you are still losing significant money to interest.
• 🟢 Healthy: APR below 10%. Generally well-priced debt (like a car loan or mortgage).